The tank is still cycleing (for the next couple weeks) and I need 1 guppy to speed up the cycle. My lfs only has fancy guppies, not normal. Are fancy's likely to survive the cycle (with water changes)? Are they as hardy or almost as hardy as the regular guppies? I can't imagine a fish being so beautiful, and still be as hardy as guppies (oh wait...bettas).

i wouldn't think so, since they'd all be males you wouldn't have any cross-breeding. but even if you did get females and they breed, i don't think it'd be a big problem, other than ending up with less "fancy" babies.

not sure on that one. i feel like they're closely related tho, and they might cross-breed, which you probably wont want. plus, in a 5 gallon, they'll probably breed, and overpopulate in about a week, lol, so i'd stick with one or the other